Below is a list of Saint Charles SD zip codes. For your research we have also included Saint Charles Area Code, Time Zone, UTC and the local Gregory County FIPS Code. Each Saint Charles South Dakota zip code has a center Longitude / Latitude point (the Saint Charles center is -99.095397949219 / 43.086799621582). For your convenience we have also indicated if that zip code in Saint Charles observes Daylight Savings time.